ne by one, dozens of speakers addressed the large crowd gathered in Arcata's D Street Community Center on Dec. 4, passionately describing divergent views of two vestiges of the city's past placed on the Arcata Plaza nearly 60 years apart. One, the statue of President William McKinley, has stood prominently in the city's center for more than 100 years, while the other — a large boulder with a plaque marking the Jacoby Building's status as a California Registered Historic Landmark — might be easily overlooked at its place in the corner of the plaza.…